Module 8: Repairing and Modifying Dry-Lining
Patching Damaged Plasterboard
Small holes, cracks, or water-damaged sections can be repaired without full replacement.
1. Small Holes (Nail/Screw Holes, <50mm)
✔ Fill with Joint Compound – Apply lightweight filler, sand smooth.
✔ Spot-Prime Before Painting – Prevents flashing (visible patches).
2. Medium Holes (50mm–150mm, e.g., Door Handle Damage)
✔ Cut a Square/Rectangular Patch – Use a drywall saw.
✔ Install a Backing Board – Fix a timber batten behind the hole with screws.
✔ Secure New Plasterboard Patch – Screw to the backing, tape joints, and skim.
3. Large Holes (>150mm, Water Damage, Cracks)
✔ Remove Entire Damaged Section – Cut back to nearest studs.
✔ Insert New Board – Screw into studs, tape seams, and finish.
Pro Tip:
For mould-damaged boards, replace entirely and treat the cause.
Cutting Access Panels
Access panels allow maintenance of hidden pipes, wires, or valves.
1. Fixed Access Panels (Plasterboard)
✔ Mark & Cut Opening – Use a jab saw for clean edges.
✔ Frame with Timber/Metal – Provides support for the removable panel.
✔ Fix with Screws or Magnets – Ensures easy removal.
2. Professional Access Panels (Pre-Made)
✔ Plastic/Metal Covers – Snap-on or screw-fixed for a neat finish.
✔ Fire-Rated Options – Required in commercial buildings.
Best Locations:
Under sinks (for plumbing).
Near electrical panels.
Behind shower mixers.
Modifying Existing Installations
Altering dry-lined walls for new doors, sockets, or layouts.
1. Adding New Openings (Doors, Windows)
✔ Check for Hidden Services – Use a cable/pipe detector.
✔ Reinforce Framing – Install headers (noggins) for structural support.
✔ Plasterboard Edges – Fix metal or timber trim for durability.
2. Installing New Sockets/Switches
✔ Trace & Cut Out – Use a template for precise openings.
✔ Extend Wiring – Ensure compliance with Part P regulations.
✔ Secure Back Box – Fix firmly to studs or use plasterboard brackets.
3. Removing/Relocating Partitions
✔ Check if Load-Bearing – Consult a structural engineer if unsure.
✔ Salvage Usable Boards – Carefully unscrew undamaged sections.
Summary Table: Repair & Modification Guide
Final Tips:
Always isolate electrics/water before cutting into walls.
For seamless repairs, feather joint compound 6–12 inches beyond the patch.
Use fire-rated putty around penetrations in fire walls.
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